JingHong DHG-9146A & DHG-9146Y Forced-Air Laboratory Drying Oven

Overview

The JingHong DHG-9146A and DHG-9146Y are precision-engineered forced-air laboratory drying ovens designed for consistent thermal processing across industrial, academic, and quality control environments. Operating on the principle of convective heat transfer via a dynamically balanced centrifugal blower and optimized internal airflow ducting, these ovens ensure uniform temperature distribution throughout the 0.136 m³ stainless steel chamber—critical for applications requiring reproducible drying, baking, sterilization, or wax melting. With a maximum operating temperature of 300°C and a tightly controlled thermal stability of ±1°C at setpoint, the DHG-9146 series meets baseline performance expectations for ISO/IEC 17025-compliant laboratories performing routine thermal treatments under GLP conditions. The ovens are not intended for explosive, volatile, or corrosive atmospheres without additional safety certification.

Key Features

• Stainless steel interior chamber (304 grade) resistant to oxidation and chemical exposure during repeated high-temperature cycles
• Microprocessor-based PID temperature controller with dual digital display (setpoint and actual temperature), 0.1°C resolution, and auto-tuning capability
• Adjustable time-delay start and programmable timer (up to 9999 minutes) with audible end-of-cycle alert
• Low-noise axial fan integrated into a symmetrical air recirculation system, minimizing thermal gradients across the working volume
• Over-temperature protection circuit with independent mechanical backup thermostat (cut-off at 320°C)
• Ergonomic double-layer door with heat-resistant glass viewport and silicone gasket for enhanced thermal insulation and visual monitoring
• Front-accessible air inlet and rear-mounted exhaust port supporting optional ducted ventilation in accordance with local occupational health regulations

Sample Compatibility & Compliance

The DHG-9146A/Y accommodates standard laboratory glassware (e.g., Petri dishes, weighing bottles, crucibles) and metal trays up to 430 mm × 530 mm. Its chamber geometry supports simultaneous processing of multiple sample batches while maintaining spatial temperature uniformity per ASTM E2207–18 (“Standard Practice for Calibration of Forced-Convection Ovens”). Though not certified to UL 61010-1 or IEC 61010-1 out-of-the-box, the unit complies with CE-marking essential requirements when installed per manufacturer-specified clearances (≥100 mm rear/side, ≥300 mm top). It is suitable for non-hazardous solid and powder samples in compliance with USP (Drying Processes) and ISO 5725 (accuracy and precision of measurement methods), provided users perform periodic verification using NIST-traceable PT100 probes.

Software & Data Management

These models operate as standalone instruments with no embedded data logging or network interface. All operational parameters—including setpoint, real-time temperature, elapsed time, and alarm status—are displayed locally. For regulatory traceability, external validation protocols must be implemented: users are advised to integrate third-party USB or RS485-connected data loggers (e.g., Omega OM-DAQPRO-5300) to record temperature profiles compliant with FDA 21 CFR Part 11 requirements. Audit trails, electronic signatures, and report generation require supplementary software such as DeltaTrak Validator or LogTag Analyzer—neither of which is bundled with the oven.

Applications

• Moisture content determination in pharmaceutical excipients and raw materials (per USP )
• Drying of filter papers, soil samples, and polymer pellets prior to gravimetric analysis
• Curing of coatings, adhesives, and composite pre-pregs in R&D settings
• Pre-sterilization conditioning of stainless steel tools and glassware in microbiology labs
• Thermal aging studies of elastomers and insulating materials per ASTM D573
• Baking of ceramic green bodies and metallurgical specimens before sintering

FAQ

Is the DHG-9146A/Y suitable for use in a GMP-regulated environment?
Yes—provided it undergoes documented IQ/OQ/PQ qualification, is maintained per JingHong’s service schedule, and operates within validated temperature ranges confirmed by calibrated sensors.
Can the oven be connected to a building management system (BMS)?
No native analog or digital output is available; integration requires retrofitting with an external signal converter and third-party relay module.
What is the recommended calibration frequency?
Minimum annual calibration is advised; however, critical applications demand quarterly verification using a calibrated reference thermometer and multi-point mapping per ISO/IEC 17025 Clause 6.5.
Does the unit include a certificate of conformance?
A factory-issued CoC covering material origin, electrical safety, and basic functional test is supplied; full metrological certification requires user-initiated third-party calibration.
Are spare parts and service support available internationally?
JingHong authorizes select regional distributors for technical documentation and consumables (e.g., door gaskets, fan assemblies); firmware updates or PCB-level repairs are limited to Shanghai-based service centers.